MAX1844EVKIT Maxim Integrated, MAX1844EVKIT Datasheet

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MAX1844EVKIT

Manufacturer Part Number
MAX1844EVKIT
Description
Power Management IC Development Tools
Manufacturer
Maxim Integrated
Series
MAX1844r
Datasheet
1.MAX1844EVKIT.pdf (5 pages)
The MAX1844 evaluation kit (EV kit) demonstrates the
MAX1844’s standard 4A application circuit. This DC-DC
converter steps down high-voltage batteries and/or AC
adapters, generating a precision, low-voltage rail for
use as chipset, DRAM, and other low-voltage supplies.
The MAX1844 EV kit provides a 1.8V output voltage
from a 7V to 24V battery input range. It delivers up to
4A output current with greater than 90% efficiency. The
EV kit operates at 300kHz switching frequency and has
superior line- and load-transient response.
This EV kit is a fully assembled and tested circuit
board. It also allows the evaluation of other output volt-
ages in the 1.0V to 5.5V range by changing feedback
resistors R1 and R2.
19-2080; Rev 0; 07/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DESIGNATION QTY
C1
C2
C3
C4
C5
C6
C7
D1
D2
1
1
1
1
1
1
1
1
1
________________________________________________________________ Maxim Integrated Products
10µF, 25V ceramic capacitor (1812)
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
330µF, 6.3V 40mΩ low-ESR
capacitor
Sanyo 6TPB330M
0.1µF ceramic capacitor (0805)
0.22µF ceramic capacitor (1206)
4.7µF, 10V X5R ceramic capacitor
(1206)
Taiyo Yuden LMK316BJ475ML
3.3µF, 10V X5R ceramic capacitor
(1206)
Taiyo Yuden LMK316BJ335ML
2200pF ceramic capacitor (0805)
1A Schottky diode
Nihon EP10QY03,
International Rectifier 10MQ040N,
or Nihon EC10QS03
100mA, 30V Schottky diode
Central Semiconductor CMPSH-3
General Description
DESCRIPTION
MAX1844 Evaluation Kit
o 7V to 24V Input Voltage Range
o Accurate Current Sense
o Preset 1.8V/2.5V Output Voltage
o 1.0V to 5.5V Adjustable Output
o 4A Output Current
o 300kHz Switching Frequency
o Power-Good Output
o Over/Undervoltage Protection
o 20-Pin QSOP Package
o Low-Profile Components
o Fully Assembled and Tested
DESIGNATION QTY
MAX1844EVKIT
R13, R14, R15
R1, R2, R11,
JU9, JU10
N1A, N1B
JU1, JU2
R5, R6
None
None
None
None
R10
PART
U1
L1
R3
R4
R7
R8
R9
1
1
0
1
1
2
1
1
1
1
1
2
2
4
1
1
1
TEMP. RANGE
0
Ordering Information
4.7µH power inductor
Sumida CDRH124-4R7MC
Dual N-channel MOSFET
Fairchild FDS6982A
Not installed (0805)
130kΩ ±1% resistor (0805)
100kΩ ±5% resistor (0805)
1MΩ ±5% resistors (0805)
20Ω ±5% resistor (0805)
200Ω ±5% resistor (0805)
274kΩ ±1% resistor (0805)
0.015Ω ±1% 1/2W resistor (2010)
IRC LR2010-01-R015-F or
Dale WSL-2010-R015F
MAX1844EEP (20-pin QSOP)
2-pin headers
3-pin headers
Shunts (JU1, JU2, JU9, JU10)
MAX1844 PC board
MAX1844 data sheet
MAX1844 EV kit data sheet
o
C to +70
Component List
o
C
DESCRIPTION
20 QSOP
IC PACKAGE
Features
1

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MAX1844EVKIT Summary of contents

Page 1

... Output Current o 300kHz Switching Frequency o Power-Good Output o Over/Undervoltage Protection o 20-Pin QSOP Package o Low-Profile Components o Fully Assembled and Tested Ordering Information PART TEMP. RANGE o MAX1844EVKIT +70 Component List DESIGNATION QTY 4.7µH power inductor L1 1 Sumida CDRH124-4R7MC Dual N-channel MOSFET N1A, N1B ...

Page 2

MAX1844 Evaluation Kit Component Suppliers SUPPLIER PHONE Central Semiconductor 516-435-1110 Dale 402-564-3131 Fairchild 408-721-2181 IR 310-322-3331 IRC 361-992-7900 Nihon 847-843-7500 Sanyo 619-661-6835 Sumida 708-956-0666 Taiyo Yuden 408-573-4150 TDK 847-390-4373 Note: Please indicate that you are using the MAX1844 when contacting ...

Page 3

Table 4. Jumpers JU4, JU5, and JU6 Functions (Switching-Frequency Selection) JU4 JU5 Not Installed Not Installed Installed Not Installed Not Installed Installed Not Installed Not Installed Important: Don’t change the operating frequency without first recalculating component values. Frequency has a ...

Page 4

MAX1844 Evaluation Kit VBIAS +5V VBATT 7V TO 24V 16 VCC SHDN JU1 VCC 1MΩ 274kΩ JU3 REF 130kΩ VCC 1% SKIP JU2 17 R6 1MΩ REF 0.22µF JU5 450KHz VCC ...

Page 5

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ______________________5 © 2001 Maxim Integrated Products MAX1844 Evaluation Kit 1.0" ...

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